82 CALIFORNIA ACADEMY OF SCIENCES. 



MOLLUSCA (Continued). 



300. (P.) adleri Dall & Bartsch, sp. nov 280 



Geuus Pyramidella Lamarck 280 



301. (P.) oonica var. variegata Carpenter 280 



Geuus Odostomia Fleming 281 



Section Odostomia (Fleming) s. s 281 



302. (0.) tenuis Carpenter 281 



Section Evalea A. Adams 281 



[S. D.] (E.) stearnsii Dall & Bartsch, sp. nov 282 



303. (E.) gouldii Carpenter 282 



Section Amaura Moller 282 



[S. D.] (A.) pupiformis Carpenter 283 



304. (A.) uuciformis Carpenter, var. avellana Carpenter. 283 

 Section Chrysallida Carpenter 283 



[S. D.] (C.) diegensis Dall & Bartsch, sp. nov 284 



Section Oscilla A. Adams 284 



[S. D.) (O.) aaquisculpta Carpenter 284 



[S. D.) (0.) gramniatospira Dall & Bartsch, sp. nov 285 



Subgenus Ivara Dall & Bart.sch, subgen. nov 285 



305. (I.) terricula (Carpenter) Dall & Bartsch 285 



SUPERFAMILY TMNIOGLOSSA 285 



Family LX V. Trilonidw 285 



Genus Tritonium Link 285 



306. gibbosus Broderip 286 



Subgenus Priene H. & A. Adams 286 



307. (P.) oregonensis Redfield 286 



Geuus Ranella Lamarck 287 



308. californica Hinds 287 



Family LX VI. Cypraida 288 



Genus Cypriea LiNNfi 288 



309. spadicea Gray 288 



Genus Trivia Gray 288 



310. californica Gray 288 



311. solandri Gray 289 



Genus Erato Risso 289 



312. columbella Menke 289 



Family LX VII. Triforidm 290 



Genus Triforis Deshayes 290 



313. adversa Montagu 290 



SUPERFAMILY CERITHIACEA 290 



Family LX VIII. Cerilhiopsidce 290 



Genus Seila A. Adams 290 



314. assimilata C. B. Adams 290 



Family LXIX. Cerithiidm 291 



Genus Bittium Leach 291 



315. asperum Gabe 291 



316. californicum Dall & Bartsch 291 



317. filosum Gould 292 



318. quadrifilatum Carpenter (with evolutionary discus- 



sion of several species) 292 



319. rugatum Carpenter 295 



320. williamsoni, sp. nov 295 



Subgenus Styliferina A. Adams 295 



321. (S.) tenuisculpta Carpenter 296 



Genus Diastema Deshayes 296 



322. sp. indet 296 



Genus Cerithidea Swainson 296 



323. californica Haldemann 296 



Family LXX, Ccecidx 297 



